The word phrase "mentally ill" is not legally valid

The word phrase, "mentally ill," is not linguistically or legally valid. In fact, the word phrase, "mentally ill," is a reified concept, and thus invalid. Moreover, both Webster's Dictionary and the Oxford Dictionary do not list "mentally ill" as a valid word phrase. Thus, the word phrase "mentally ill" should never be used as a label for any person. In other words, there are not persons who are "mentally ill," and thus no person should ever be called mentally ill.